Is it okay to sleep without a bra after BA? If yes how long after the surgery can I start sleeping without a bra?

Thank you for your question. Please speak to your plastic surgeon for specific post op instructions. 

Opinions will vary by surgeon on when you can sleep without a bra after surgery.  I recommend speaking with your surgeon as he/she is most familiar with the details of your surgery and will be the best one to advise you.

Dear blahhlala,every plastic surgeon has his own postoperative protocol which he recommends to his patients. I would suggest you to discuss this with your plastic surgeon.
Daniel Barrett, MD, MHA, MS 
Certified, American Board of Plastic Surgery  

Member, Am. Society of Plastic Surgery